Hello, I am wondering if anyone has managed to get this cookie. I got the Tempest one, and this is the last one. Looking for clues. I have thrown regular cookies, I have thrown in some of the more common 20 year colored cookies. Anybody? Thanks
I am not certain if there is any guarantee to tossing in specific items and getting the "20th Anniversary Riftborn Kumos Cookie", at least not one that I have come across at this time.
Users have tried throwing in other Anniversary Kumos Cookies but have reported that this is not a key to the reward.
A quick peak at the "The Rift v.13" forum post under the Games board reflects this following data by those who frequently post their rewards. There isn't much reported about the cookie being awarded.
The data pulled from the forum shows that items that have been thrown into the Rift have been both inexpensive and wardrobe items (both items being wardrobe items for feet).
HOWEVER, Amber did comment on a News or Announcement post "Twenty Years of Memories": "For those saying the Rift and Tempest are harder to get, yes. They require you to do something more than once to get it. I didn't want you all to get every cookie in one go 😛 This is the last time I'll say this: You have multiple months to work at getting these. That also means multiple months for me to rerelease the Crystal Shop & Token ones, getting out more lightning rods, etc." What stuck out here to me is the use of "require you to do something more than once". Does this mean the action of using the Rift daily or could it be by completing the same action at the Rift? Is it the fact that you should be using the Rift once a day and the number of consecutive days play a role in obtaining the cookie or if I throw in the same item at approximately the same time on each visit will increase the odds? Does it mean nothing? Amber also commented earlier in the same News/Announcement post saying: "All the cookies will be available until the end of the year. 😊 It's only been a few days, give it some time going to rift! There are months for me to play with bringing out more of those tempest rods! 😉" Could we see a gradual increase in the odds of pulling one of these elusive cookies as we get closer to the end of the year?
There really isn't much else that I could find regarding the Riftborn Cookies.
I'm going to shove as many Brown Tennis Shoes as I can into that Rift every day from now on!!
Hunting for: (It's the only beanbag I need for a full collection!)
I have gotten 1, but what I threw in wasn't anything specific.

arid cloth warador footgear 2x worked for me. Thanks for the input & good luck to you!
Did it work for you? I sent 2 pairs to a friend, & it did not work for her. :(
I threw in and got one, but I haven't been able to get another...
Has not worked for me, but I am still trying different things. (:
I was wondering if throwing in rift items would work but I keep forgetting to try. Items such as the riftborn blob plushie and other riftborn plushies might work? I've tried the brown tennis shoes as well as the arid cloth warador footwear. Tomorrow I'm going to get more serious, today I wasted my chance and threw junk.